Process of producing the calcium salt of acetyl salicylic acid.



iIN TED sTn'rEs rn rnn'r OFFICE.

RUDOLF BERENDES, OF ELBERFELD, GERMANY, ASSIGNOR T FARBENFABRIKEN VORM. FRIEDR. BAYER & C0,, OF ELBERFEIJ), GERMANY, A CORPORATION OF GER- MANY.

riaoons s or PRODUCING-THE CALCIUM SALT or AGETYL SALICYLIC ACID.

No Drawing.

Specification of Letters Patent.

Application filed September 12, 1911. Serial No. 648,994.

Patented Mar. 12,1912.

To all whom it may concern: I 1

Be it known that I, RUDoLF BERENDES, doctor of philosophy, chemist, citizen of the German Empire, residing at Elberfeld, Germany, have invented new and useful Improvements in New Processes of Producing the CalciumSalt of Acetyl Salicylic Acid,

of which the following is a specification.

My ifivention relates to a new and valuable process for the production of the caloium salt of'acetyl salicylic acid having most probably the formula:

methylalcohol. The calcium compound is filtered off and dried. It crystallizes from alcohol in the shape of colorless almost tasteless needles which are easily soluble in water furnishing a neutral solution. A yellowish-gray precipitate is obtained with ferric chlorid. It is a valuable soluble substitute'for acetyl salicylic acid.

I claim:

1. The process for producing the calcium salt of acetyl salicylic acid, which process consists in treating an alkaline salt of acetyl salicylic acid with a calcium salt, substantially as described.

2. The herein described process for producing the calcium salt of acetyl salicylic acid which process consists in treating an alkaline salt of acetyl salicylic acid with a calcium salt of an acid which yields with alkalis salts which are soluble in alcohols, substantially as described.

In testimony whereof I have hereunto set my hand in the presence of two subscribing witnesses.

RUDOLF BERENDES. [L.S.] Witnesses:

L. NUFER, ALBERT F. Norm. 

